@ceilingcat - It is sad that their language is close to being extinct. However, if none of the current Wichita feel interested in learning it, no one can make them. I'm sure that in this digital age the language could at least be preserved, in case any future Wichita want to learn it.
Also, I don't think their entire culture is going to become extinct though, even if their language does. They do still have tribal headquarters, as the article said. I feel like that means at least some of them are interested in preserving their culture and tradition.